l(1)20Ca << bk1 << l(1)20Cb << bb << bk2 << l(1)carot3
Df(1)X-1 males show a slight increase (<3-fold) in second-chromosome nondisjunction and a large (>700 fold) increase in XY nondisjunction. Unlike wild-type cells, XY nondisjunction is independent of the frequency of sex chromosome nondisjunction in Df(1)X-1 cells. Nondisjunctional second chromosome pairs are as likely to be at the pole opposite the X chromosome or that opposite the Y chromosome in Df(1)X-1 mutants, while they are more likely to be opposite the Y in wild-type cells. Likewise, nondisjoined XY and nondisjoined second chromosomes segregate independently from one another in Df(1)X-1 cells. Df(1)X-1 cells have a similar meiotic drive to wild type. Df(1)X-1 males are sick and not fully fertile.
Homozygous females and hemizygous males are not viable.
male viable with BSYy+ fertile with BSYy+ male viable with Dp(1;Y)y+mal+. male sterile with Dp(1;Y)y+mal+.